You cannot use the datassette but just an external disk-drive on device numbers 8 to 15, this is the procedure:

- Switch OFF the Vic-20
- Insert the Mega-Cart
- Connect the disk-drive
- Insert the floppy disk with the "MC-PREFS" backup file to the Drive
- Switch ON the disk-drive
- Switch ON the Vic-20 by holding CTRL key

The Mega-Cart automatically restore preferences from the "MC-PREFS" file on the floppy-disk.

Please note that the Mega-Cart checks for an external disk-drive on device numbers 8 to 15 (in this sequence) in order to load preferences so if you use for example the drive 10, please disconnect or switch off the drives 8 and 9 first.

Once the restore process is successfully finished, the Early Startup menu comes up automatically with backup settings otherwise a proper error message will be displayed.